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Forum: Pentax SLR Lens Discussion
06-10-2017, 05:46 AM
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I have a Tamron Adaptall 300mm f2.8 lens with Tamron 1.4X and 2X teleconverters that I wanted to use as a guide scope on my C-11 telescope. I bought a Tamron Adaptall adaptor for M42 (Pentax screw mount), a set of M42 extension tubes (Fotodiox) and a (Svbony) M42 eyepiece adapter for 1.25" oculars. I used the Tamron adaptor threaded to the small and medium extension tubes threaded to the eyepiece holder, I use the focus ring on the Tamron 300 mm lens to focus and it works in all configurations with 40 mm to 7.5 mm eyepieces. Works like a charm.
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